Allwedd mathemateg.
Baker, David,1961-
Kervegant, Ffion.
Aberystwyth : Canolfan Astudiaethau Addysg,
2002.
Argraffiad Saesneg gwreiddiol = Original English edition: Cheltenham : Stanley Thornes, 1997.
Addasiad Cymraeg gan = Welsh adaptation by: Ffion E. Kervegant.
Mathematics